TM 1-1520-238-T-5
8–27
8–7.
SYSTEM DESCRIPTION (cont)
8–7
3
33
3
MAGNETIZED
COMPASS
CARD
NORTH - SOUTH
COMPENSATING
MAGNET
(SCREWDRIVER
ADJUST)
0 - 5
VDC
EDGE -
LIGHTING
LIQUID - FILLED BOWL
MAGNETIC NORTH POLE
EAST - WEST
COMPENSATING
MAGNET
(SCREWDRIVER
ADJUST)
6
PIVOT POINT
AND POST
PILOT MAGNETIC COMPASS
M68-154
Figure 8–20.
Pilot Magnetic Compass
d. Miscellaneous Instruments.
(1) Purpose.
Miscellaneous instruments display hydraulic pressure, FUEL quantity, outside temperature,
and time. The pilot indicator edge–lighting is controlled by the pilot EXT LT/INTR LT panel. The CPG
edge–lighting is controlled by CPG INTR LT panel.
(2) System of Operation.
(a) The pilot dual hydraulic pressure indicator (fig. 8–21) receives inputs from the primary and utility
hydraulic pressure transducers. The hydraulic pressure transducers convert hydraulic pressure into 0 to 5 VDC
signals. VDC power moves the pointers across the dial. The pointer moves with changes in pressure.
(b) The pilot emergency hydraulic pressure indicator (fig. 8–22) receives inputs from the utility hydraulic
system emergency pressure transducer. The emergency pressure transducer converts hydraulic pressure into 0
to 5 VDC signals. VDC power moves the pointer across the dial. The pointer moves with changes in pressure.
(c) The FUEL quantity indicator (fig. 8–23) receives operating and lamp supply voltages from the SDC.
Aft and forward fuel cell sensors supply fuel cell data to the fuel quantity indicator. The dim/test panel provides
display lamp test, digital blanking, and display lamp dim/bright automatic control.
